All widgets in OOUI and Mediawiki have the Widget suffix, and the ones that use the multiselect widget have the Multiselect suffix. CategorySelector should thus be CategoryMultiselectWidget.
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Change 344588 had a related patch set uploaded (by Prtksxna):
[mediawiki/core@master] Rename CategorySelector to CategorySelectorWidget
Change 344592 had a related patch set uploaded (by Prtksxna):
[mediawiki/core@master] ForeignStructuredUpload.BookletLayout: Use CategorySelectorWidget
Change 344593 had a related patch set uploaded (by Prtksxna):
[mediawiki/extensions/UploadWizard@master] Use CategorySelectorWidget instead of CategorySelector
Change 344588 merged by jenkins-bot:
[mediawiki/core@master] Rename CategorySelector to CategoryMultiselectWidget
Change 344592 merged by jenkins-bot:
[mediawiki/core@master] ForeignStructuredUpload.BookletLayout: Use CategoryMultiselectWidget
Change 344593 merged by jenkins-bot:
[mediawiki/extensions/UploadWizard@master] Use CategoryMultiselectWidget instead of CategorySelector
@matmarex I don't think there are any other instances of CategorySelector that need to be replaced. Even so, till what time should we keep the deprecated class and RL module?
We actually have a shiny new policy at https://www.mediawiki.org/wiki/Deprecation that says "at least one major MediaWiki version". So we should wait for MW 1.29 to be released with the deprecation, and then we can remove it to land in MW 1.30. But this isn't a big burden to support, so I don't think there's any hurry. :)
Change 424976 had a related patch set uploaded (by Prtksxna; owner: Prtksxna):
[mediawiki/core@master] [BREAKING CHANGE] Remove mw.widgets.CategorySelector
Change 424976 merged by jenkins-bot:
[mediawiki/core@master] [BREAKING CHANGE] Remove mw.widgets.CategorySelector